Core for sheet material



Aug. 2, 1955 A. J. GRAMP come FOR SHEET MATERIAL 2 Sheets-Sheet 1 Filed Sept. 11 1950 :m MW, v MM m IENToR. ALFRED J. GRAMP Om wm wm hm ATTORNEY Aug. 2, 1955 A. J. GRAMP CORE FOR SHEET MATERIAL 2 Sheets-Sheet 2 Filed Sept. ll 1950 INVENTOR. ALFRE D J. G RAM P ATTORNEY Unite States Patent 2,714,493 CORE FOR SHEET MATERIAL Alfred J. Gramp, Philadelphia, Pa. Application September 1l, 1950, Serial No. 184,285 6 Claims. (Cl. 242-74) This invention relates to core supported sheet material 'in which a sheet o1' web of any desired material but particularly sheet plastic, coated paper, textiles, and analogous materials manufactured, handled, stored, or sold in continuous lengths, is mounted or wound on a core, tube, or shell as of paper, cardboard or other material, and to novel cores used for such purposes.

It has been common practice in the prior art to take a tubular core usually circular in cross-section on which to wind sheet material as set forth above by simply using the outside surface or periphery of the tubular core as a starting surface for such operation. While such practice is satisfactory for materials which do not deform, it is quite unsatisfactory on materials that do readily deform. For example, on certain materials such as plastic yard goods, the nature of the material is such, that when t wrapped on such tube or core, the material shows the starting lap marks for a number of convolutions which may extend through a length of such material for from live to fifteen or so yards, depending on the nature of the material and the tension used Iin the winding operation. For many purposes where lengths of such material are used, as for example in upholstering, such lap marks make the material useless, with the results that there is substantial loss of material which must be discarded.

Further in many rewinding operations, there is breakdown of shell or core due to the insertion of driving spiders in common use today in rewind operations.

Among the objects of the present invention is the production of core supported sheet material wound on said core, free from surface deformation.

Other objects include cores which may be used for that purpose.

Still further objects and advantages of the present invention will appear from the more detailed description set forth below it being understood that this more detailed description is given by way of illustration and explanation only, and not by way of limitation since various changes therein may be made by those skilled in the art without departing from the scope and spirit of the present invention.

In connection with that more detailed description the accompanying drawings illustrate features of the invention wherein Figure 1, a fragmentary detail, partly in section, of the skiving operation on a core; in

Figure 2, a fragmentary detail, partly in section, of the skiving mechanism; in

Figure 3, a fragmentary detail, partly in section of the skiving mechanism; in

Figure 4, a fragmentary detail, partly in section of the skiving mechanism with core removed; and in Figure 5, a view of the desired iinal product namely sheet material wound on a core.

In accordance with the present invention, core-supported sheet material wound on said core is produced free from lap marks. This result is obtained by winding such sheet material on a core in which the end of such rice 2 sheet material immediately adjacent said core is held in place thereon so that ythe end of the sheet at which the rst convolution begins is held on the core in a position to avoid any sharp edge projection of material whereby lap marks in subsequent convolutions are avoided.

The desired product is well illustrated in Figure 5 in which the core 1 is provided with an externally positioned, skived flap 2 lying closely contiguous to the wall or" the core, the sheet material 3 being wound thereon with its inner end 4 lying within the space 5 formed between ilap 2 and core 1. The flap 2 holds the end 4 of the material 3 securely in position so that the convolutions of material 3 are readily produced by winding operations. ln View of this arrangement, no lap marks appear on the material 3.

Such wound sheet material may be that where the material is wound on a jumbo roll as in manufacture, or more particularly where the material is taken from such jumbo roll and rewound on a core for shipment or other distribution. Since this latter situation involves lengths of material less than that on the jumbo roll, it is particularly important to be certain that no lap marksappear in such rewinding operations. The term rewind will be particularly used for that purpose to designate such materials removed from the jumbo roll and rewound for storage or shipment. It represents a very important utilization of the present invention.

The core l may be made of any desired material. Commonly such cores are made of cardboard and the invention will be illustrated by such cardboard cores, although cores made 0f any other type of material suitable for use may be employed such as plastic, composition, metal, etc.

The skived ap 2 is desirably formed by a cutting operation as set forth below, from the wall material of the core l, so that the flap 2 desirably tapers outwardly in cross-section from its thickest portion at the point Where it is part of the core to its outer end thereby forming a feathered edge which lies contiguous to the core surface, tangentially and actually forms a continuation of the core periphery at that point. While the llap 2 can be formed separately and attached as by cementing along one edge to the core to present a gradually curving outer face forming a continuous surface avoiding lap marks in convolutions of wound material thereon, as for example by the use or" a curved meniscus or convexconcavo material (in cross section), production of the flap by a skiving operation directly from the core itself is a relatively simple, economical and satisfactory operation as pointed out below.

The sheet material wound on the core may be of any desired type, including plastic, coated paper, textiles, and will be illustrated by sheet plastic which deforms under pressure and consequently will exhibit lap marks in winding operations, unless the expedient of the present invention is practiced. The nature of the material, the thickness thereof, the tension of the winding operation, temperature, and possibly other factors enter into deformation causes, but are eliminated by the present invention. This is particularly true with such sheet plastic as is commonly used for upholstery purposes and represents a particularly important application of this invention.

While as pointed out above, any type of core with desirably a skived flap may be used, a core particularly as shown is preferred and may be produced as. illustrated below. As shown in Figures l through 4, a core desirably of cardboard as explained above is preferably ernployed and is subjected to a slitting or skiving action to provide a skived flap. The term skived flap is used here to refer to any such element on the core to serve the function of holding the end of the sheet material against displacement and permitting winding ofthe sheet material on the core without production of lap marks in convolutions of the sheet material. Other terms like slit, slot, c ut, hinged portion, at proper angle in the wall of the core or tube and substantially tangentially to the periphery or outside surface of the core or tube may be apt. In -the machine ,for producing the preferred form of skived flap, it is desirable that: (l) the -tube or core be maintained in exact parallelism with the path of the cutter blade or knife; (2) there be readily accessible mechanical means to Ihold the tube in position for the cutting or skiving operation, which means may be clamping arrangement outside the core or an expanding mandrel within the core, the latter being preferred, and sufficient pressure or force being exertable by said mechanical means to straighten out the core if bent o r out-of-round and restored to normal condition; (3) electrically operated means to drive the mechanism whereupon electronic controlled devices may be employed to maintain and effect safety measures; and (4) a cutter, slicer, rotary knife, `or blade to facilitate the slit, cut, skive, etc., in the tube, shell or core, means to control the cutter or knife speeds, and means to maintain the cutter or knife for proper operation as to reciprocation, travel, or feed, etc.

Referring to Figures 1 and 2, the core 1 is mounted on a mandrel generally designated as 50, hereinafter called the skiving machine mandrel. The sliding bar connector 51 is attached to support 102 which is part of the mechanism for operating the skiving machine mandrel, as further described below. The weight of the mandrel and associated mechanism is counterbalanced by Weight arm 511 attached at 512 to an end of mandrel 50. The opposite end of the mandrel 50 is positioned or centralized on a locking pin 56 carried in bearing 57 which locking pin seats in a locking pin bearing 58 xed in the end of the mandrel 50.

A rotary knife or cutting blade 59 carried on shaft 60 of motor 61 is mounted on motor support 62 to move on tracks 63, 63 for the full length of core 1.

The skiving machine mandrel 50 may be released for placement thereon `of a core to be skived as follows. A lever 82, pivoted at 83 on bracket 84 which latter is mounted on the frame at 35, has a slot S6 within which moves a pin S7 on a locking pin 56. The end SS of lever 82 has a slot 89 within which a clevis pin 90 of clevis 91 is positioned. A link 92 threaded at one end into clevis 91 is threaded at the other end into clevis 93 which latter carries clevis pin 94 positioned within slot 95 on arm 96. The latter is pivoted intermediate its ends at 97 on bracket 98 attached to the frame at 99. The inner end 100 of arm 96 is pivoted at 101 in a support 102 attached to the sliding bar connector 51.

The skiving machine mandrel 50 has a tube 103 which serves as the structural spline therefor, supporting all of the parts of the mandrel per se for actuation. An expanding pad 104 carries a series of rollers 105 mounted thereon on brackets 106, the brackets 106 and rollers 105 extending through openings 107 in the tube 103 in-teriorly thereof. The sliding bar connector 51 is connected to the lalining shaft 51 51 carries a series of blocks 10S each having a face 109 in which a cam shaped angular track 110 serves to receive .the roller 105. A stationary pad 111 is attached as by spot welding to tube 103 at a line opposite to that of expanding pad 104. Pad 104 maintains the core in exacting tolerance for the skiving cut and is used in xing the exact parallel relation of mandrel 50 with the pad of the knife travel.

AReferring particularly to Figures 1 and 2, it will be for cam maintenance which shaft Y' seen that when lever 82 is moved to the left, locking pin 56 is withdrawn from bearing 58, so that the mandrel 50 is free to move with arm 511 which pivots on pin 52. At the same time, link 92 moves arm 96 to actuate sliding bar connector 51 to a retracted posi-tion of the expanding pad 104 since rollers 105 ride down the grooved tracks 110 in blocks 10S to the lowerrnost position of the rollers 105. See Figure 4. The expanding pad 104 is thus moved inwardly so that a core 1 may be positioned over the skiving machine mandrel 50.

When core 1 is placed over the skiving machine mandrel 50, the latter is moved about a pivot to horizontal position and lever 82 moved to the right to the position shown in Figure 2. Locking pin 56 is thus moved with in its bearing 58 to hold mandrel 50 carrying core 1 in position. At the same time, link 92 moves the sliding bar connector 51 outwardly carrying blocks 108 with it and causing roliers to mount the blocks 108 and expand the expanding pad 104 y'against the inner wall of core 1 rigidly holding it against movement. The rotary knife is then operated as explained above lto produce the skiving cut as shown in Figure 3. When the skived flap is thus formed, the knife motor has returned to initial position and the core may be removed by again shift* ing lever 82 to the left.

VHaving thus set forth my invention, I claim:

1. Core supported sheet material comprising a tubular non-metallic core and sheet material core carrying an externally-positioned flap skived partly into the core and lying closely contiguous to the wall of the core, the ilap tapering outwardly to a feathered edge substantially tangential to the surface of the core and forming a continuation of the core periphery, the inner end of the sheet material being held between said skived flap and the core wall adjacent thereto, whereby the sheet material wound on said core presents no lap marks in the initial layers of wound material.

2. Core supported sheet material as set forth in claim 1 in which the skived ap is integral with and formed from the material of the core.

3. A non-metallic core for supporting sheet material said core carrying an externally positioned flap skived partly into the core and lying closely contiguous to the wall of the core, the flap tapering outwardly to a feathered edge substantially tangential to the surface 0f the core and forming a continuation of the core periphery to grip the end of sheet material inserted therein.

4. A core as set forth in claim 3 in which the skived iiap is integral with and formed from the material of the core, and forms a continuous circular outer surface with the core periphery.

5. Core supported sheet material as set forth in claim 4 in which the core is made of cardboard.

6. Core supported sheet material as set forth in claim l in which the core is made of cardboard.

References Cited in the file of this patent UNUSED STATES PATENTS 833,481 Paugh Oct. 16, 1906 1,446,929 R-ivetta Feb. 27, 1923 1,534,868 Roney Apr. 21, 1925 1,759,095 Coker May 20, 1930 1,845,526 Spence Feb. 16, 1932 2,066,568 Jones Ian. 5, 1937 2,074,968 Orr Mar. 23, 1937 2,273,533 Mather Feb. 17, 1942 2,410,905 Slusher Nov. 12, 1946 2,467,607 Bates Apr. 19, 1949 wound thereon, thev 

